Directions: Underline the correct subordinating conjunctions to use to
form complex sentences.
1. I was leafing through the encyclopedia (when, who, where ) the telephone rang.
2. (Although, Since, While) I was busy, I answered the telephone.
3. My aunt called up (as if, before, unless) she dropped by to visit.
4. She wanted to come by (as, because, so that) she wanted to give me something.
5. (As, Provided, Until) I was waiting, I felt very excited.